The White House said on Tuesday that it would nominate Jonathan Kanter to be the top antitrust official at the Justice Department, a move that would add another longtime critic of Big Tech and corporate concentration to a powerful regulatory position.

President Biden’s plan to appoint Mr. Kanter, an antitrust lawyer who has made a career out of representing rivals of American tech giants like Google and Facebook, signals how strongly the administration is siding with the growing field of lawmakers, researchers and regulators who say Silicon Valley has obtained outsize power over the way Americans speak with one another, buy products online and consume news.

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Sarah Miller, the executive director of the American Economic Liberties Project, a progressive advocacy group, said in a statement that “President Biden has made an excellent choice to lead the D.O.J.’s antitrust division,” noting that Mr. Kanter had “devoted his career to reinvigorating antitrust enforcement.”